"The man with a cross no longer controls his destiny; he lost control when he picked up his cross. That cross immediately became to him an all-absorbing interest, an overwhelming interference. No matter what he may desire to do, there is but one thing he can do; that is, move on toward the place of crucifixion."

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The best that Gauss has given us was likewise an exclusive production. If he had not created his geometry of surfaces, which served Riemann as a basis, it is scarcely conceivable that anyone else would have discovered it. I do not hesitate to confess that to a certain extent a similar pleasure may be found by absorbing ourselves in questions of pure geometry.

— Albert Einstein